# yukicoder No.423 ハムスター語初級（数詞）

n = input()
n_bi = ""

while n != "":
    if len(n) == 3:
        n_bi += "0"
        break
    elif n[3] == "u": # 前から4文字目だけ見ればhamかhamuか分かる
        n_bi += "1"
        n = n[4:]
    else:
        n_bi += "0"
        n = n[3:]

print(int(n_bi,2))